MPI_Send (buf0, buf_size, MPI_INT, rleader, 0, MPI_COMM_WORLD);
}
else if (rank == 1) {
memset (buf0, 0, buf_size*sizeof(int));
MPI_Send (buf0, buf_size, MPI_INT, rleader, 0, MPI_COMM_WORLD);
}
else if (rank == 1) {
memset (buf0, 0, buf_size*sizeof(int));